Holder for grindstone-truing tools



(No Model.)

N. H. SNIDER. HOLDER FOR GRINDSTONE TRUING TOOLS. No. 273,625. PatentedMar.6, 1883.

. III In NITED STATES NICHOLAS H. SNIDER, OF PITTSBURG, PENNSYLVANIA.

HOLDER FOR GFIlNDSTONE-TRUING TOOLS.

SPECIFICATION forming part of Letters Patent No. 273,625, dated March 6,1883. Application filed September 23, 1882. (No model.)

To all whom it may concern Be it known that I, NICHOLAS H. SNIDER, ofPittsburg, in the county of Allegheny and State of Pennsylvania, haveinvented a new and useful Improvement in Tool-Holders; and I do herebydeclare the following to be a full, clear, and exact descriptionthereof.

My invention relates to improvements in the tool-holder patented to mein Letters Patent No. 257,400, dated May 2, 1882, and has for its objectto provide the said patented holder with a bed-plate in which it mayslide, power devices for moving it in said bed-plate, and certaindetails of construction.

To enable others skilled in the art to make and use my invention, I willnow describe it by reference to the accompanying drawings, in which-Figurel is a plan view. Fig. 2 is a side elevation. Fig. 3 is alongitudinal section on the line an 00 of Fig. 1. Fig. 4 is across-section on the line y y of Fig. 1.

Like letters of reference indicate like parts in each.

The holder is composed of a fiat body or toolrest, a, having twoperforated lugs, 11, at the front end, a rear extension or handle, (I,at the back end, an eccentric orjaw, e, mounted on a pin or shaft whichextends between the lugs 11, and having a handle or lever, e". In such atool-holder the tool lies longitudinally on the rest, passes between thelugs b b, and is held by the eccentric or jaw 0. Thus far the tool isthe same as that in my former patent.

In order to use this detachable holder or tool with a bed when desired,I provide the rest or body a with flaring or dovetailed edges a, andplace it in a bed-plate, g, which is open at its ends, but alopg thesides is provided with flanges g, which form a cavityin cross-sectioncorresponding in shape to the form of the body a, so that when the bodya is placed in the bed-plate it can be moved freely backward and forwardtherein. On the upper face of the body a, at or near one edge, is arack, a the teeth of which are of any suitable or desired shape. On thesides of the bed-plate (1,01)- posite to each other, are perforated lugs71, through which extends a bolt, 2', secured in place by anut, i, so asto be removable at pleasure. Mounted on the bolt 4', which acts asashaft thereto, is a lever, 7c, the lower end of which is provided witha toothed segment, k, the teeth of the segment gearing into and engagingwith the rack a on the bodya. The purpose of this construction is toenable the tool-holder to be forced forward in the bedplate against theface of the stone upon which the toolfis acting.

The bed-plate is placed on the grindstoneframe in such a way as to giveita firm, steady bearing, and to enable considerable force to be exertedon the lever k without displacing it. Such force is necessary becausethe action of the swiftlyrevolving undressed grindstone exerts too muchpower to enable the tool to be held up against it properly by hand.

\Vhile itis desirable to use the construction of lever having a toothedseginent,just described, because it gives a long throw to thetool-holder, yet I do not limit myself to such form, as a simple leverworking against a projection on the body or rest a would enable me toforce up the tool-holder in the required mannerand with sufficientpower.

On the rear end of the handle (I is a pivoted link, (1, and on the rearend of the handle 0 is a rack, 6 having any desired number of teeth. Thepurpose of the link (land rack e" is to enable the jaw e to be securedfirmly in place when biting upon the tool f. The rack 6 runs diagonallyto the axis of the handle 0 so that the link (1 maybe used to hold thearm 6 when tools fof different degrees of thickness are used in theholder. The rest 0, projecting below the level of the body a. acts as astop to prevent the body a from sliding too far back in the bed-plate g.

In the dressing and cuttingofgrindstones by the use of tools of thisclass it has been necessary for the workman to wear goggles or shieldsof other kinds to prevent the grit and sand from the stone from enteringthe eyes.

In order for the further protection otthe eyes, and, if desired,todispense with the use of goggles,I have applied a shield, m, whichcurves over the cutting-point and intercepts the particles of sand whichtly npward,and casts them back upon the face of the stone. This shieldis made pret'erablyof sheet metal, and is secured either to the lugs bor upon the shaft of the jaw e, or oh other suitable part.

WVhat I claim as my invention, and desire to secure by Letters Patent,is v 1. 1n devices for dressing grindstones and forlike purposes, adetachable tool-holder composed of a rest having dovetailed edges, andan eccentric jaw arranged longitudinally of the rest and pivoted theretoat one end, in combination with a bed-plate having a dovetailed recesswherein the tool-holder may slide, substantially as and for the purposespecified.

2. In a device for dressing grindstones and for like purposes, adetachable tool-holder composed of a rest having dovetailed edges, a lugor rack on its upper face, and an eccentric jaw pivoted at one end ofthe rest, in combination with a bed-plate having a dovetailed recesswherein the tool-holder may slide, and a lever fulcrumed on thebed-plate, substantially as and for the purpose specified;

3. Atool-holder fordressiug grindstonesand 20 for like purposes,composed of a body or rest, an eccentric jaw pivoted thereon at oneextremity, and a shield mounted on the journals of the pivoted jaw,substantially as and for the purpose specified. 4. In a tool-holderhaving a body or rest, and an eccentric jaw pivoted at one end thereof,the combination of a tapering rack attached to the free end of thepivoted jaw, and a link pivoted on the rest, substantially as and forthe purpose specified.

In testimony whereof I have hereunto set my hand this 18th dayofSeptember, A.D. 1882.

NICHOLAS .H. SNIDER.

Witnesses:

W. B. (JoRWIN, F. B. KERR.

